doc, I helped out a friend in early 80's and he was a Webasto dealer, back then most of the Volvo's & Bimmers didn't come with factory S/R and he had a pretty decent business in putting these in for some major dealers. These are the same units Webasto OEM for a lot of the foreign imports.
I remember it was quite a bit of chop (oops, body) work to install one of these in that they would cut away some of the cross braces for the opening, and welded in the frame for the S/R for structural integrity.
I would imagine that if you were going to go with the factory roof, quite a bit of body work as well as upholstery work are required. May want to contact Webasto and locate a dealer/installer near you just to get some ball park #'s for the labor.
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